5 papers
A broadband outburst of the compact steep-spectrum quasar 3C 138 in 2024-2026
T. V. Mufakharov, Yu. V. Sotnikova, V. V. Vlasyuk +20
After several decades of relative quiescence, the compact steep-spectrum quasar 3C 138 entered an active phase in 2024-2026, exhibiting strong broadband flaring. We investigate its…
Spectroscopic galaxy redshifts in the Peanut cluster -- a massive nearly head-on cluster merger shortly after pericenter passage
I. Zaznobin, N. Lyskova, I. Bikmaev +13
The Peanut cluster (SRGe J023820.8+200556, SRGe CL0238.3+2005, = 0.42) has recently emerged as a candidate for a rare, massive merger, potentially analogous to the Bulle…
X-ray emission of the Nuclear Stellar Disk as seen by SRG/ART-XC
Valentin Nezabudkin, Roman Krivonos, Sergey Sazonov +5
The Nuclear Stellar Disk (NSD), together with the Nuclear Stellar Cluster and the supermassive black hole Sgr A*, forms the central region of the Milky Way. Galactic X-ray backgrou…
SRG/ART-XC All-Sky X-ray Survey: Sensitivity Assessment Based on Aperture Photometry
N. Y. Tyrin, R. A. Krivonos, V. A. Arefiev +10
The Spectrum-Roentgen-Gamma (SRG) observatory continues to operate successfully in orbit at the Lagrange point L2. The Mikhail Pavlinsky ART-XC telescope has demonstrated high effi…
SRGAJ230631.0+155633: an extremely X-ray luminous, heavily obscured, radio-loud quasar at z=0.44 discovered by SRG/ART-XC
Grigory Uskov, Sergey Sazonov, Igor Lapshov +7
We report on a detailed study of a luminous, heavily obscured ( cm), radio-loud quasar SRGAJ230631.0+155633, discovered in the 4--12 keV ene…